#!/usr/bin/env python
#_*_coding:utf-8_*_



def Max_low(int_List):
    if isinstance(int_List,list):
        try:
            return (max(int_List), min(int_List))
        except TypeError as e:
            print ('Must be use all int')



print(Max_low([1,2,3,4]))
print(Max_low([1,2,3,'bbbb']))